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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'c2d701907dadf5b223005990f4341dc814e34db35c7003103e08636f0a7503e5' 
  AND token = '49/aDryq0dV2+aQ5lQ0EI39wxNY7ycFJflFuBvQJwW0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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