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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '75c5e076777affad0057231ac3f771f08a2665f7e5d61fc1934abc455071e086' 
  AND token = 'Nfrwdf3BbU2/3op8MahzDbOZ3DdUft51UJu3bFbeRWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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