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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '66274c63b895a137edb1123cd5e967978c6db30ad961869e15fa31d73181ca3c' 
  AND token = '8OV2R+j9BTOqqEEV+yT/zKd5QdAldyUC54yPCFAbtrc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}