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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '77cdc25bc456eaf55e6b0b6759e7765f5098209bf4275e93d31a69ec7596981b' 
  AND token = 'gn+W/4oI4Gi+aeuy1Asro9cafbB3VgmKfJmmnFgeZqA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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