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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'b7daca9c4261c49d0c21fa8bc237f6a402e7ba71529334cf75d52ddff62905ce' 
  AND token = 'Tzcj2c03nkpsRD2avBdkP+FHBMAm7v7PYM2Q2+ZemLY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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