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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '80c0ac1813e18d7f47ecfa01789d799ac6934f1f4b50938b14ab95e196c26c68' 
  AND token = '00C7sXH/7mtUJM6L5iR33yvK0bJbivoJj37lLX3LIE8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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