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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '53fc157e3dbfcacb859f370a8ec031f38d500ba4f15c0abd24f7b4f19b8b47e1' 
  AND token = 'b09Fbo1AEpL70dPS099h47sqo2fU9b6btx62lmBXlVA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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