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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'bd4ccd05017f1433858be6b2291ac56f79cddc50d8669c61b6a076fcdce097e6' 
  AND token = 'OUKFqlsz24lC+0AoSRPtCtiOJb5dRGtX0SHLdxmGX1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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