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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '7dfb890709fa62e01bdd4ef2e8d070efae27dd6f972bc6e3c8034d42caeb82c5' 
  AND token = 'ZPg21m5g8CMYQlFW5SAhx0Xkm7hg1pdFrvtgwU67hNM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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