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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '87201d45b156dcad1041aa81dfe4fcbfdcf7ceb4248a866e10cddd87fa6ada46' 
  AND token = 'v08LLq/Fk0sedUYKMhyx3LpnscuZnb3Omd35N7zGfHM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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