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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '0f9fca38e4f11621aebcbbc4c45f86acc40cf12c1d2da5fe03993125cc477c49' 
  AND token = 'cw7gmKkWr2Pjf4Tc0/hMw9il4jRFXCUuiv3YQeswAtw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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