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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '63883955602fe0e40cca0eae4f8b89cd7c6c933961dc32881a8683a3a1b7c8f8' 
  AND token = 'dLucOKR4OQSTMKfF9cDr1b2R3ngKUuIvMWZ3wIGLQSk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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