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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd46cee8fca92757772a242f513717f70367ce9410ad0e5b05ef37e60952b0a82' 
  AND token = '2fdgjZgeTMNB1PcKL/GKzOi7X55Wi2ZR0nRq2PWxFlE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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