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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'b71630d17c42b48cc52afb36091b2604e67d1077207eceebe0d9ec38a96a2272' 
  AND token = 'kamHKkBmzAoWVAaJduns4ihQ4lV8qyoZoypvLAh5290=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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