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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '8081ad9bbba1777b0922969e0f4c3071fe5d76449c2a60aa941793e21f240dac' 
  AND token = 'Taw0IjAMOgcz5dU3TWrgKxzzrVUnV8yWjDuNLMAR9z8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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