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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd775faa961c76fd792a127f9e7239e7141614359c2eb80bd2679111c6eaf5d3a' 
  AND token = 'fNdzdg3mvylJ5s7Yr/gccGslV7CEae3THtyE3I+W/u0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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