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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '959d09240168cc8f8ee346db9deeb4aed37d7a7091c77e2f793eb7ec8fd75a24' 
  AND token = 'niyjNhKEm0hJ2Rw9mV0Gk7nL5+EIAtRYd22Y1GY3VVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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