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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '9ffa0f0861d9580933d6f44fd43301a1a12efe364d140f2dac3a4ad016a0b95a' 
  AND token = 'aCVJ2uDGo8CsBXBr5V2L550sME/+dv9yCOq2HpHdTqQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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