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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'ba00587223d06e85c3406d2a4ec3a1c8e1bcb7c2c4e277d5e316e9acfa1f8dfa' 
  AND token = 'E4WHGsWDgG4VAAPhyZsYoTExovABJ8wi6nPdA7aN0xc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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