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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f8156cb62eaf5c7c9ae732f1553df986eba5947aad97c799c83a27091c4830f3' 
  AND token = 'm2IuRdqULJh5/JS3nshAdR+h7I3XRTStA2qpUL3EvAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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